10/09/2007 @ 12:00PM

In Pictures: Ten Ultimate Rainforest Adventures

The Amazon, Brazil

At 1.2 billion acres, this is the largest rainforest in the world, and 60% of it is found in Brazil. Travelers here will see massive Brazil nut trees; 40,000 plant species, including lilies; 2,000 bird species, such as blue macaws; and nearly 400 kinds of reptiles, including the yellow spotted turtle. Visitors can go on treks, take overnight boat trips down the Amazon or fish for piranhas in one its many tributaries.